Did my account get hacked?

Hi, I am raising lvl. 196 demonslayer in reboot server called SadSpaniel. When I played on April 2nd, everything was fine including the hair I got from royal hair coupon. But I logged in today and I found out that the hair of my character changed to one of the basic ones. I am currently looking at other characters if I lost anything else but for now, this is the issue. If someone logged in between 1:00 am 4/3/2020 to 4:30 pm 4/3/2020, that is not me. I am asking if I can get my hair back?